Examine source code of Green hexagon theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green hexagon",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(54, 57, 63, 0)",
      "toolbar_text": "rgb(122, 179, 108)",
      "frame": "rgb(122, 179, 108)",
      "tab_background_text": "rgb(122, 179, 108)",
      "toolbar_field": "rgb(54, 57, 63)",
      "toolbar_field_text": "rgb(122, 179, 108)",
      "tab_line": "rgb(122, 179, 108)",
      "popup": "rgb(54, 57, 63)",
      "popup_text": "rgb(122, 179, 108)",
      "tab_loading": "rgb(122, 179, 108)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{468d696c-18d0-4d47-b4d1-43c46ae26d5a}"
    }
  }
}